months before the fbi was brought on to the case. >> that was nbc's andrea mitchell reporting. some lawmakers are demanding that general petraeus testify at some point about the deadly attack at the u.s. consulate in benghazi which he independently investigated. >>> incumbent senator scott brown of massachusetts who lost to elizabeth warren is calling on his republican party to move to the middle. >> we need to be a larger party. i'm a pro-choice moderate republican, there's a vanishing breed. you know that now. you've lost joe lieberman, richard lugar, kent conrad, me, olympia snowe. that group in the middle, it's vanishing and there are on both sides there are extremes as you all know kind of pushing back against the middle. i've always felt that that group in the middle is, quite frankly, the most powerful group because they're able to get to that 60-vote fleshhold and get things done so i'm hopeful we'll be a more tolerant, you know, open-minded party. >> there is speculation that brown could make another run for national if president obama names senator john kerry to his c